sys-apps/systemd: add v256.5 with musl libc patches

- https://code.atwilcox.tech/sphen/scaly/systemd
- https://catfox.life/2024/09/05/porting-systemd-to-musl-libc-powered-linux/

sys-apps/systemd/files/0010-basic-Support-musl-definition-of-rlim_t.patch

@@ -0,0 +1,30 @@
+From ff5d3856b452bc6890b54a94b40302029195d965 Mon Sep 17 00:00:00 2001
+From: "A. Wilcox" <AWilcox@Wilcox-Tech.com>
+Date: Sun, 18 Aug 2024 02:44:04 -0500
+Subject: [PATCH 10/34] basic: Support musl definition of rlim_t
+Content-Type: text/plain; charset="utf-8"
+Content-Transfer-Encoding: 8bit
+
+This cannot be upstreamed, but we should find a better way anyway.
+
+Signed-off-by: Alexander Miroshnichenko <alex@millerson.name>
+---
+ src/basic/format-util.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/basic/format-util.h b/src/basic/format-util.h
+index ba7cff6a8b55..6239051d5f88 100644
+--- a/src/basic/format-util.h
++++ b/src/basic/format-util.h
+@@ -43,7 +43,7 @@ assert_cc(sizeof(gid_t) == sizeof(uint32_t));
+ #endif
+ 
+ #if SIZEOF_RLIM_T == 8
+-#  define RLIM_FMT "%" PRIu64
++#  define RLIM_FMT "%llu"
+ #elif SIZEOF_RLIM_T == 4
+ #  define RLIM_FMT "%" PRIu32
+ #else
+-- 
+2.41.0
+